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. Compliance & Closure, Inc <br /> Groundwater Sampling Protocol <br /> Latest Revision: March 1998 <br /> custody form and placed in a chilled ice chest for shipment to a laboratory <br /> certified by the State of California Department of Health Services <br /> Sample Storage <br /> Groundwater samples collected in the field are stored in an ice chest cooled <br /> to 4 C whale in transit to the office or analytical laboratory. Samples are <br /> stored an a refrigerator overnight and during weekends and holidays . The <br /> refrigerator as set to 4 C and is locked with access controlled by a <br /> designated sample custodian. <br /> Quality Assurance/Quality Control Objectives <br /> The sampling and analysis procedures employed by Compliance & Closure, Inc <br /> for groundwater sampling and monitoring follow quality assurance/quality <br /> control (QA/QC) guidelines Quality assurance objectives have been <br /> established to develop and implement procedures for obtaining and evaluating <br /> water quality and field data an an accurate, precise, and complete manner <br /> In this way, sampling procedures and field measurements provide information <br /> that is comparable and representative of actual field conditions . Quality <br /> control (QC) as maintained by site-specific field protocols and requiring the <br /> analytical laboratory to perform internal and external QC checks The goal <br /> is to provide data that are accurate, precise, complete, comparable, and <br /> representative . The definitions as developed by overseeing federal, state, <br /> and local agency guidance documents for accuracy, precision, completeness, <br /> comparability, and representativeness are <br /> o Accuracy - the degree of agreement of a measurement with an <br /> accepted reference or true value <br /> o Precision - a measure of agreement among individual measurements <br /> under similar conditions . Usually expressed in terms of the i <br /> standard deviation. <br /> o Completeness - the amount of valid data obtained from a <br /> measurement system compared to the amount that was expected to <br /> meet the project data goals <br /> 0 Comparability - express the confidence with which one data set <br />